Defect structures in YBa/sub 2/Cu/sub 3/O/sub 7-x/ produced by electron irradiation

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Defect structures in YBa/sub 2/Cu/sub 3/O/sub 7-x/ produced by electron irradiation at 300/sup 0/ K were investigated by transmission electron microscopy. Threshold energies for the production of visible defects were determined to be 152 keV and 131 keV (+- 7 keV) in directions near the a and b (b > a) axes (both perpendicular to c, the long axis in the orthorhombic structure), respectively. During above threshold irradiations in an electron flux of 3 x 10/sup 18/ cm/sup -2/ s/sup -1/, extended defects were observed to form and grow to sizes of 10 to 50 nm over 1000 s in ... continued below

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Pages: 7

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Kirk, M.A.; Baker, M.C.; Liu, J.Z.; Lam, D.J. & Weber, H.W. December 1, 1987.

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Defect structures in YBa/sub 2/Cu/sub 3/O/sub 7-x/ produced by electron irradiation at 300/sup 0/ K were investigated by transmission electron microscopy. Threshold energies for the production of visible defects were determined to be 152 keV and 131 keV (+- 7 keV) in directions near the a and b (b > a) axes (both perpendicular to c, the long axis in the orthorhombic structure), respectively. During above threshold irradiations in an electron flux of 3 x 10/sup 18/ cm/sup -2/ s/sup -1/, extended defects were observed to form and grow to sizes of 10 to 50 nm over 1000 s in material thicknesses 20 to 200 nm. Such low electron threshold energies suggest oxygen atom displacements with recoil energies near 20 eV. The observation of movement of twin boundaries during irradiation just above threshold suggests movement of the basal plane oxygen atoms by direct displacement or defect migration processes. Crystals irradiated above threshold were observed after about 24 hours to have transformed to a structure heavily faulted on planes perpendicular to the c axis. 3 refs., 3 figs.

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Pages: 7

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NTIS, PC A02/MF A01; 1.

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  • Fall meeting of the Materials Research Society, Boston, MA, USA, 30 Nov 1987

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  • Other: DE88005981
  • Report No.: CONF-871124-87
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 5373351
  • Archival Resource Key: ark:/67531/metadc1069423

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  • December 1, 1987

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 28, 2018, 12:45 p.m.

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Kirk, M.A.; Baker, M.C.; Liu, J.Z.; Lam, D.J. & Weber, H.W. Defect structures in YBa/sub 2/Cu/sub 3/O/sub 7-x/ produced by electron irradiation, article, December 1, 1987; United States. (digital.library.unt.edu/ark:/67531/metadc1069423/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.